Stirring Bars and Rods
Products of various sizes, shapes, and material compositions designed to aid in manual or automatic stirring of laboratory solutions. Includes glass stirring rods, magnetic stir bars, and stir bar retrievers.
What Is a Magnetic Stir Bar?
Magnetic stir bars are stirrers or stirring hotplates used with magnets to mix a liquid or solution by creating a vortex.
A number of factors affect magnetic stir bar efficiency and effectiveness, including its size, shape, and material. Sizes (L x Diameter) range from 2 x 2 mm to 159 x 27 mm and shapes include:
- Polygonal or octagonal magnetic stir bars are the most common shapes; the multiple surfaces add turbulence to the mixing action
- Elliptical or egg-shapped stir bars work especially well with round-bottom flasks
- Wedge-shaped spin bars produce more significant turbulence for dissolving salts or in samples containing sediment
- Spin bars with fins or vanes, designed for smaller vessels, tubes, or cuvettes
- Micro (“flea”) stir bars for mixing extremely small samples
What Kind of Magnet Is Used?
Stir bar magnets are typically made from Alnico, a combination of aluminum and nickel. They may also be made from Samarium cobalt, a rare earth metal that produces the stronger magnetic force needed to mix very viscous substances.
Stir bar magnets are usually encapsulated in white or colored PTFE, hard plastic, or borosilicate glass, and coatings may meet FDA grade or USP requirements. PTFE is durable, inert, and can be autoclaved. Glass-encased cylindrical magnets are useful for high-temperature applications.
How Does It Work?
During the stirring process, integral or removable pivot rings on the stir bar reduce contact with the vessel to help avoid marring plastic surfaces. Some round stir bars have slightly raised ends that create a de facto pivot point, while others have more pronounced round centers that help to keep them in motion. Stir bars may be reusable or disposable.
Magnetic stir bars may be sold individually or in magnetic stir bar kits that include multiple bars in a range of sizes.
MSC US Cargo Control Ratchet Strap, Polyester, 27 ft, 2 in
This polyester ratchet strap tie down is designed for securing various loads. It features a robust construction with specific dimensions and a high breaking strength, equipped with a reliable J-Hook end fitting for secure attachment.
- Features a load capacity of 3,333 lb.
- Constructed from durable polyester material.
- Measures 27 ft in length.
- Has a width of 2 in.
- Equipped with steel end fittings.
- Comes in a yellow color.
- Offers a breaking strength of 10,000 lb.
- Includes a J-Hook end type for secure fastening.
RENICK LABS LLC Disposable, Parylene-encapsulated stir bars for 8x30mm glass shell vial work, 1000/pk
Need disposable stir bars for use with 8mm glass shell vials? RL 352A stir bars are the perfect size. Parylene is vapor deposited to the surface of every stir bar ensuring the best possible encapsulation and guards against reaction interference. While the vast majority of chemical reactions do not affect the Parylene coating, extended stirring times of heterogeneous mixtures at elevated temperatures, ethereal solvents such as Dioxane and THF may cause degradation.
Chemglass Life Sciences Stir Bar, Magnetic, PTFE, Length x Dia. in mm: 38.1 x 7.93, Length x Dia. in inches: 1 1/2 x 5/16
Stir Bar, Magnetic, PTFE, Length x Dia. in mm: 38.1 x 7.93, Length x Dia. in inches: 1 1/2 x 5/16. Octagon cross-section having a molded-in pivot ring manufactured with FDA-grade and USP Class VI PTFE. The PTFE coated Alnico magnet permits magnetic agitation without contamination.SEE CG-2001-50 FOR STIR BAR KIT
Azzota Corp Magnetic Stirring Bars - B Type, 30mm Length, Dia. 10mm
Magnetic stirring Bars - B type, 30mm length, Dia. 10mm
Chemglass Life Sciences Plain PTFE Magnetic Stirring Bar, 50 x 8 mm, for Magnetic Stirrers
Plain PTFE-coated magnetic stirring bar (50 x 8 mm) for general-purpose laboratory mixing on magnetic stir plates. Its cylindrical plain profile provides effective agitation and produces increased turbulence at low speeds, while the PTFE coating offers chemical resistance and a non-stick surface.
- Plain cylindrical shape for general-purpose stirring.
- Dimensions: 50 x 8 mm.
- PTFE coating provides chemical resistance and non-stick surface.
- Produces increased turbulence at low stirrer speeds.
- Compatible with standard magnetic stir plates and laboratory mixers.
- Sold individually for easy replacement.
Fireflysci P68 Mixer for Semi-Micro Cuvettes (Type 9, Type 9B, Type 9BM, Type 9F, Type 9M)
Manual mixer fits any standard 10mm pathlength cuveette with a 4mm inside width• Made of clear acrylic with a straight handle, this tool is used when reactives are performed directly into cuvettes to mix added reagents. Up and down motion in cell provides complete mixing• Shaft diameter- 3.17mm (0.125 inches)
Sigma Aldrich Fine Chemicals Biosciences BRAND MAGNTC STIRBAR OVAL 20MM
NC3369712 BRAND MAGNTC STIRBAR OVAL 20MM